Cocaine's cut and ground (6)
I believe the answer is:
chewed
'ground' is the definition.
(chewing is a kind of grinding)
'cocaine's cut' is the wordplay.
'cocaine' becomes 'C' (drugs abbreviation).
'cut' becomes 'hewed' (I've seen this in another clue).
'c'+'hewed'='CHEWED'
'and' is the link.
(Other definitions for chewed that I've seen before include "Masticated, worked with teeth" , "Made use of teeth" , "Munched" , "Masticated between teeth - maybe gum" , "Worked or ground between the teeth" .)